Qin Shi Huang

His real name is "Ying Zheng" (嬴政えいせい, Eisei), with Qin Shi Huang or "Shi Huang Di" (秦し始こう皇てい, Shikōtei) being a title which literally means "First Emperor of Qin". He's the founder of the Qin Dynasty and the first emperor to unify China, widely regarded as the greatest emperor in all of Chinese history. He has also been referred to as "The King Where It All Began" (始まりの王, Hajimari no Ō), the "King of Men" (人の王, Hito no Ō) and "The Greatest King" (最高の王, Saikō no Ō) throughout his battle with Hades.